Generator of short electric waves



March 11, 1930. A. ESAU GENERATOR SHORT ELECTRIC WAVES- Fi'led NOV. 1926 per of" the generated waves.

Patented Mar.- 11, 1930 l UNITED STATES ABRAHAM ESAU, or JENA, osmium! GENERATOR OI SHORT ELECTBTG WAVES Application file'd irovember 2, 1926, Serial No.

a This invention relates tomeans for the generation of short electric waves in highfrequency technics and more particularly to an arrangement whereby large quantities of 5 ener may be obtained. .When generating very short waves the constants of the oscillating circuit decisive for .the wavelength obtained are constituted merely by the inherent inter-electrode capacities, the grid- 10 anode capacity especially, of an oscillating vacuum tube and the self-inductance of the connecting wires, a capacity at will being inserted' in series with the inherent tube capacity in order to further shorten the length Obviously the high-frequency power obtainable by such an arrangement becomes smaller the shorter the wave length, i. e., the smaller theelectric dimensions of the circuits; and according to 20 my invention I provide two tubes connected in amanner to be described hereinafter, whereby the energy available may be largely increased.

The invention is more fully set forth with 25 reference to the accompanymg drawing,- it being understoodthat other modifications of the arrangement and the application thereof may be made without departing from the scope of the appended claims. Two threeelectrode vacuum tubes of substantially equal dimensions having cathodes I0 and. k grid electrodes g and g and anodes a and a re spectively, have their corresponding electrodes connectedby conducting wires. By w is indicated a high resistance or choking device placed symmetrically to the tubes be tween the connecting wires of the grids and l cathodes respectively. This arrangementassuming capacity 0 tobe absent- 1s similar to the push-pull generating connection well known in short-wave work. The two inherent grid-anode capacities of the tubes are here in series constituting, together with their connecting wires an osci latory circuit adapted to generate excessively short a electric waves. According to my invention a ca- I pacity c is inserted between the'connecting wires of" the, anode and grid electrodes respectively,-thus dividing the circuit formed I 0 by the two inherent tube capacities, gridshort electric waves comprising in combination two three-electrode vacuum tubes of e ual dimensions having incandescent cath- -0 es, grid electrodes and anodes, wires con- 145,787, and in Germany November 10, 1925.

anode and their connecting wires into two electrically symmetrical circuits a c g, and

a2 c y having substantially equal natural frequencies. The advantage of this arrangeinent =over the afore-mentioned arrangement without the capacity 0 consists in that while allowing still shorter waves to be generated, a ca acity c, which may be given any value an may be made variable may be used as a shortening condenser in series with the respective grid-anode capacities of the tubes, whereas with the arrangements employed before the inherent tube capacities were of fixed value. At the same time an additional advantage is gained, in thatdouble the energy of a single tube is obtained. A load circuit aerial) may be coupled in any known way y direct, inductive, capacity or mixed coupling) with the two oscillating circuits. p is a plate-voltage battery connect- 0 ed symmetrically to both tubes as indicated in the drawing. his the A-battery.

'What I claim is: 1. An apparatus for the generation of necting the corresponding electrodes of said tubes, and a capacity inserted'symmetrically to said tubes between the wires connecting said grid and said anode electrodes whereby two oscillating circuits constituted by the re- 1 spective inherent grid-anode capacities in series with'part of said connecting wires and 5 with said capacity of substantially the same natural frequency are obtained, and'means in said circuits for always maintaining the .anodes at a higher positive potential than the grid electrodes. 1

2. In an apparatus according to claim 1, wherein the means for maintaining the proper relative anode-grid tensions com rises a high resistance connected symmetricfiy to both tubes between oints of the wires connecting the grid an cathode respectively.

' In testimony whereof I have aflixed my signature.

ABRAHAM ESAU'. 

